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Magnetic bearings are oil-free bearings that are widely employed in rotating machineries such as high-speed motors in order to eliminate lubrication systems, reduce wear, increase efficiency and mechanical service life. Based on a high-speed motor with a power of 5 kW and a maximum speed of 60 000 rpm, active thrust magnetic bearings are designed to match with the high-speed motor considering the...
This paper describes a novel Ku/Ka band reflectarray antenna for operating at arbitrary polarization. The reflectarray elements consist of two different types of elements: cross-dipole element with fixed-dimension ring for the lower band, and the ring element with round patches for the upper band. Furthermore, the parameters of the element are optimized to suppress the coupling effects. The simulated...
OpenFOAM is a framework of the open source C CFD toolbox for flexible engineering simulation, which uses finite volume method (FVM) in the discretization of partial differential equations (PDEs). The problem solving procedure in OpenFOAM consists in equations dicretization stage, equations solving stage and field limiting stage. The best parallelism is limited by the equation solving stage, which...
Recent advances in deep learning have shown exciting promise in filling large holes in natural images with semantically plausible and context aware details, impacting fundamental image manipulation tasks such as object removal. While these learning-based methods are significantly more effective in capturing high-level features than prior techniques, they can only handle very low-resolution inputs...
We present a data-driven inference method that can synthesize a photorealistic texture map of a complete 3D face model given a partial 2D view of a person in the wild. After an initial estimation of shape and low-frequency albedo, we compute a high-frequency partial texture map, without the shading component, of the visible face area. To extract the fine appearance details from this incomplete input,...
In this study, we developed a direct patterning system based on infinity-corrected optics for light-induced fabrication of hydrogel microstructures, while still visualizing the fabrication process in real time by integrating the objective lens and red LED system. The optical projection system for reducing the size of patterns from film mask to desired substrate was optimized through the theoretical...
Although efforts have been done to solve collision avoidance using either environment recognition sensors or vehicle-to-vehicle (V2V) communication information, it is still a challenging problem in some specific scene, e.g. highway entrance ramp. In this paper, we propose a new cooperative adaptive cruise control (CACC) method which combines information of environment recognition sensors and V2V communication...
In this paper, we investigate the physical-layer network coding (PNC) scheme based on successive interference cancellation (SIC) in multi-way relay channels (MWRC). We consider a scenario where all users simultaneously transmit signals to the relay in the up-link stage while the relay broadcasts a coded message in the down-link stage. In order to extract the network codes from superimposed signals...
Online learning is the result of the development of network technology and computer technology, which emphasizes the openness of learning resources and communication among students. Online learning has become the mainstream of learning, and a large number of learners participate in it. The essence of online learning is the continuous development of students' cognitive level, and to acquire effective...
By decoupling the control plane from the data plane and providing programmability for network applications, software-defined network (SDN) is positioned to offer more efficient management, higher flexibility and better performance. Routing and resource allocation are two closely related applications in wireless networks. With close cooperation, better performance and lower complexity can be achieved...
Endmember extraction is a critical step of spectral unmixing. In this paper, a novel endmember extraction algorithm based on evolutionary multi-objective optimization is proposed for hyperspectral remote sensing images. In the proposed method, endmember extraction is modeled as a multi-objective optimization problem. Then the root mean square error between the original image and its remixed image...
This paper presents a digital power amplifier with two cores that are power combined for a Psat of +32.5dBm. Assisted by an on-chip digital pre-distortion, a transmitted output power of +26.8dBm for 802.11g 54 Mbps 64-QAM is achieved. This is the highest reported linear output power for a digital power amplifier designed for 802.11b/g/n applications in bulk 28nm CMOS. A total area of 0.36mm2 is used...
In this study, the feedback controllers were designed and implemented to fulfill the constant-voltage (CV) and constant-current (CC) output modes for a power converter. This converter's power stage was composed of a stand-by power, power factor corrector, and DC-DC converter. The topology used by the DC-DC converter was a phase-shifted full-bridge with a parallel current-doubler rectification converter...
This paper aims to study on the subjective feelings of drivers when active safety technologies are used. In this paper, a complete subjective evaluation system is established taking the lane departure warning system as an example. Firstly, the evaluation index system is established and the subjective evaluation table is developed. Then the table is analyzed and tested. The result shows that the subjective...
Band selection is a crucial preprocessing step for hyperspectral image classification, which is a classic feature selection method. Feature selection is designed to select feature subsets to represent the whole feature space. For feature selection, two crucial issues need to be handled: preserving information and redundancy reducing. In this paper, a novel feature selection method for hyperspectral...
A feedforward linearization technique to cancel the third-order intermodulation (IM3) of the down-conversion mixers is proposed, in which a low-frequency second-order intermodulation tone (IM2) is created and multiplied by the mixer's output to generate the IM3 tones for the cancellation. The proposed linearization technique is applied to an active mixer operating at 2 GHz. Fabricated in a 0.13-µm...
Matching multiple patterns is the key technology in firewall, Intrusion Detection Systems, etc. However, most of the web services nowadays tend to compress their traffic for less transferring data and better user experience, which has challenged the multi-pattern matching original working only on raw content. Naive and straightforward solutions towards this challenge either decompress the compressed...
Due to adoption of a large amount of multipliers, the standard Farrow filter structure in digital resampling design has been the performance bottleneck of wideband signal demodulation. To improve demodulation performance, this paper proposes a full parallel resampling filter structure based on iterated short convolution algorithm (ISCA). The proposed design can effectively reduce the consumption of...
We design an automatic photo-power control system (APC) to control Transmitter Optical Sub-Assembly (TOSA) optical-power to be stable at a wide range of temperature variation, prove long transmission distance for fiber transmission at high temperatures. The architecture of the APC circuit include current control and electrical-power control system has a microprocessor be core unit to send and receive...
Hybrid Cloud is a composition of private and publicclouds, which can assist an application to utilize the advantages of distinct clouds and achieve high availability, scalability and robustness. Despite its benefits, hybrid cloud can present special challenges such as cloud heterogeneity, inconsistent interface, communication overhead between clouds and etc. In this paper, we propose a novel prediction...
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